Packing.



E..H. SMITH.

PACKING.

APPLICATION FILED MAY 11, 1914.

PatentedJu ly 20, 1915.

orruon.

ERNEST HOPE SMITH, OF CLEVELAND, OHIO.

PACKING.

Specification of Letters latelit.

Patented uly 20, 1915.

Application filed May 11, 1914. Serial No. 837,884.

To all wk 0122. it may concern:

Be it known that I, Ermns'r Horn SMITH, a citizen of the United States,residing in the city of Cleveland, in the county of Cuyahoga and theState ofOhio, have invented a certain new and useful Improve- "rod orplunger.

To such end and object my invention provides a packing constructed offibrous material cemented or woven together with a hollow space orcavity extending lengthwise throughout its length, the packing being ofsubstantially rectangular shape in cross section and the top and bottomwalls of the packing being thinner and of less bodytlian the side walls,as illustrated in Figure 1. Fig. 2 is a perspective view of I an oldform of ackin F ig. 3 is a en spective view of my packing 'afterexpansion. Fig. 4 is a perspective view of my packing applied to a rod.

By constructing the top and bottom walls thinner and of less body thanthe side walls the friction between the packing and the rod or plungeris reduced in proportion to the difference between the thickness of theside walls and that of the top and bottom walls. As friction between thepacking and the'rod or plunger wears the packing away, by reducing thefriction the packing wears longer. The top and bottom walls of thepacking being thinner than the sidewalls there is never more pressureexerted laterally upon the rod or plunger than is necessary to withstandthe initial steam, air or hydraulic pressure upon the packing. andconsequently there is no unnecessaty friction between the packing andthe rod or plunger. The thinner top and bottom walls of the packing areless firm and more resilient than if constructed the same thickness asthe side walls. Consequently the packing will expand and contractlaterally mlore readily and will be more sensitive to any 'disalinementor irregularity of the rod or plunger. By constructing the top andbottom walls thinnerand of less body than the side walls the weight ofany given length and size of packing is reduced from 15% to 20% ascompared to the old style hollow packings which are constructed with allwalls of equal thickness. This-is an important improvement, in themanufacture of hollow packings, as it enables the manufacturer toproduce the packing more economically. From a given weight of rawmaterial of the same nature a greater quantity of the applicants packingcan be manufactured than of the old style hollow packings. For example,if it requires five pounds of raw material to produce twelve feet offive-eighths inch packing constructed with all walls of equal thicknessas in the old style hollow packings, it will only require a little overfour pounds of the same material to inanufacture an equal length andsize of the applicants improved hollow packing.

What I claim as new and desire to secure by Letters Patent is:

A hollow'center packing of substantially rectangular shape in crosssection composed of fibrous material cemented or woven together, the topand bottom walls being of less body and thinner than the side walls,substantially as described.

In testimony whereof I have hereunto signed my name;

ERNEST HOPE SMITH.

copies of this patent may be obtained for five cents each; by addressingthe Commissioner of Patents,

Washington, D. C.

